SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc690e7265ab37a270889b1178f45d684505c1ade15f1b7af428edb95bc5fe70' 
  AND token = 'ncVw87S6GYARRs2VBOXgk6KFzuxZ7gu0yofEVHyfjDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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