SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6326f4140adbcb2a3141b3bd86a7d764910bbfe504a1e9a24d8c3ca9d6103677' 
  AND token = 'j6sMpovHEoFSnic4L+fvKYBpsxr3ZxrLfGpw2Q0HYRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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