SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf13306e4228432f4b69d7ed90a7e45dcef5b7973fdedfa3f179229f749bbd51' 
  AND token = 'Awwlc4ALemzq5JVkhmSfWilq96S+jLXCQgzoLh23yh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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