SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc561ca4f81d85431682ce29363736b89e16bb258ef4d9957ad265bc9853ebed' 
  AND token = 'Kd+hP5PDj6XStUEGYsioOWcKsnSu79W9pFyqvYLdTkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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