SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa05800cf79f30da1410274113e7d0c337e3676787b4db8c96a4fa6031cacab7' 
  AND token = '5hKMzGOZcwJudWAhog4ROMDhse5GPjdquEMNE/lRllY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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