SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93bfaf5249da93e7b6a34276b0ad8e59cdc47f7242b858f393fd6fd870bb98c2' 
  AND token = 'yAnl2//Bxl7R1wCZBpUcyMIpQsbneSohCtPZIvCCKQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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