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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a662dbeaf40910d615458cf7637c26b37ca8276f4b85d865980e0e5969047844' 
  AND token = 'CBGKc6T8pRv2W9m41k3WS5KydCT7g3uCQdg9JDi8pcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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