SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d009a4667716a8933e443b85a48fa6e02cde37b70643f4b7e7539c779fc7bc1' 
  AND token = 'MHr26RsRDOuLeCNFRmuzoQVMJ2jP1EJUwrEvdD/Y0N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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