SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63d9b5416c5b12e81db997892e75a90fdc9bea7691008b8670b7e35f4fdadc19' 
  AND token = 'FelYSCFXv5jHePur63dMKY3iPJP3Rv11g8JXXK3Q/sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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