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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5116abcf6cf6f93963271ed0d0208f856b2abf499503a9205f5a9bd5ac50f8c' 
  AND token = 'uH2cn1ZByedp4/x3ud3I8gr8+oMK+A80ic1SS9mrUEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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