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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd25c9840b1b0555e8ac1a4c63f0363c0952b51d43eb86620cdae704971275fa2' 
  AND token = 'b4lcmMSXfnTqnMTI2enUCXPOJp5P6etIH26de0aTDZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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