SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '443266599ffda51f85f140382a8a0796ec774dd2837c8ec07f0a1a7adbf6af91' 
  AND token = 'k2oPRWvcXPi1VtzKcVijvxNHCwRPpPXmrZeQwNGTcg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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