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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f880ce0703647056317d4ff8b8eb35ae5ed02d56650f63e7fc8dfd6c258345e' 
  AND token = '5ov86h1KAXqVbV5bQLWtVKonvq+moueGwqb57xled58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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