SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2edfddc1027820165499b6a565873b77f85f1602644018b9eb471148ed6c12a1' 
  AND token = 'OLnTLu32fBZKvI4GXF1Dx00q5Wq3bDPJDFx/W1Cjcgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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