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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7d691216cac7d7c18c975b12159f970418ee65d241e8149f62ca26b48c8ce5f' 
  AND token = 'kuY1jD/iO7yeEQpaaleF+MlMMj3RfpRdHgu8CiVGzvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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