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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99eb57f3e849f8dd2ffc6d6acf22e8ddd2a0b9b1a44b7b2cc32996a33f0d0920' 
  AND token = 'E2urZjsd9Sv7TyA8hcbn+7Aa51Uo3KjuvQcKdESRJbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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