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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ae41f7f2bf6e08f4cdf33c78b024eb4887d4a0396acb205fca60464feb2505a' 
  AND token = 'nP+3IcitfodYx+ZaINhYJsz+11/7bhxlKN98RN1yUnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}