SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '129df6df0283b342af2c1888cc3c62aada6fe157062c458cbf4cd975f636e644' 
  AND token = 'yl/RpRWAF39B5o6jVx179lKjMuxKkEOTXJnqBzCs6Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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