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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ccddd2bfec65a64815214826e0a15666b75b1f68a8d1f12126e507f3ef870fd1' 
  AND token = 'BKjRQfhYe7oyC71iauzxey2QLOIfOzidgg5BfvUe0kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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