SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1099910ad2cec95bb0523b3e4374f9c6f5b1a1335558260029b9cf58655c019d' 
  AND token = 'hXY+v6wQttZdqcy2FAAnHXOyFgsDT4bwGrSlYc/CIqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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