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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc2bbaffb3c16f7b82fa817223ca61976975770e36a0e74add664132e254442f' 
  AND token = 'BrtBnGRQ3xH8uo+URARjNv1cUCA8UDP5WOM6A/fNwy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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