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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '948a3a8e8a5bcd898eeb0430b1a8ac6008498f91809a285592ed079231dc8210' 
  AND token = 'DDd5w2FdPfLUBhooAYYLwv3eBM70cX3bL98aZlz8L2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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