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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '908a3bcd084f604ab66d8763c4367aa0733d52bb0b2ffbbe7d340bdaa40fca19' 
  AND token = 'F0RR3cLz5jEwvMvbi0lPZkRqUBjh1SniUl8k1qyDjng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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