SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1786ab31ed893e529de56357a22423466795a695bbcddcacf4434867537d70fb' 
  AND token = 'XGVOK7+NpTJjvuqRgcqS/1f8RUMIZbB6VbdRtc+10Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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