SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b81486878f8edd6ea9aea5fd1c278901a0a473bd79364bd11583c94c28d1775' 
  AND token = 'JZpvdDBwlczqkrHrCSDkguy25XXqMXoA+w4g5xOJy30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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