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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c26c569ce14c068ee0ab3ffca29a177a9ddd3fcd975b88ce915ae53ffac15cf' 
  AND token = 'keTh9WI/8Zn1J8OB3YZbbzss7KtaTa78xbYHeWTRobo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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