Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f8ca4b90a13798f36d2641669d9215cd988ddda3f74b1355aa94832a1232a0e' 
  AND token = '/nYpS+dy7s89shbfheRPhC93QEvWA2MstjrMVjLl/uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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