SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e37c3f64eb7d0af96a492315bdaf08b21e95800a09a595ca472ef42ba567621f' 
  AND token = '9Wd4eVjPtL1BymbpzgxfuF5b1MMn8vDoUlAJVgZDmBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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