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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18f602eb7fa34d5cc2b55aecc347a574c7cde9f6ca0677dd2813015db9ce5c31' 
  AND token = 'Dmjkk60xG29hxR/rYV9yrSulKV5oOdswi0MvTZ76ooc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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