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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e14c090128adca9fd5abedb67d8fef0a857ec115075f42f5ee2d16ed9e832aa' 
  AND token = '3cBq6DGjBj9EzHmyvwhMuZ2yTDyQaBxc7J7DftqOyj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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