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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e32f3e228e29d9911611115319e4d7980335f075c5591410eb18161f2414fda' 
  AND token = 'QqUZ+5GKwt5NxUzKWozBH2ayT5xtu2OPBeGRkglnEJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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