SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3051b4db178ef4f67e13a13f9f488c9629911ad7a04e82250619db87789e1fdc' 
  AND token = 'bB+/J/53LFCBHLRQa34TQtV0qscTqWuBuFSkfMKeHC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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