SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2e8a74b984dedd1662e8ec47a9ea040245aa526bf3e287445741b1daf88dca6' 
  AND token = 'qbDFvFzshg3g9K9NMDfg+q5ghqYen6L8BWMuVRsH/Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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