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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84562e1b9d0686f79bc9cf5ac1119a3931a866700f08b725ca6fb569ea5f993b' 
  AND token = 'L6IN82PNvSLM6z6CN8hb5JPVa15glAotPMbn5hKvARg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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