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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a649e0b3e0661ba0f89a95a60a0f5908bc0149ba41dee38070ee7544a35c5b30' 
  AND token = 'X3nx933zQkZ+V4IkPWaV3Pp3PD2Yx7YCifNE0wXT9h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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