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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9dc3ee66228e8ed1c6673e37296ddff0e922b837f03503ca4a833f3a8881c339' 
  AND token = '476brGUXrl9te4qNk9Ag3nxnI7JXqTmvMst6LJI71ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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