Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a73b5fe4f5659ee74a083b061aabb55a9a9388114ad7459d670c2d5dee26cf02' 
  AND token = 'QrdpnXn3ru6MGuDytqHbAD2LIr/Q7+vfzZFNq6edYZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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