SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24d89abc53244eb216d0c68488ea9744cdb8e14263cd17141e7e5930135f2896' 
  AND token = 'x4DJrb/WnxcGCCHoSVrK7bmjuu19QY8PVG6WvQzdS4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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