SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da18fab204b26ffb79e63ea2b2f62b5ed7120f069c2533c71a4df14e443f915e' 
  AND token = '9cmt1PjEGDRgT1EXrzGvAOwQCBtGv4L0pLOB2IllbVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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