SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53836b5dede2a184fbab4d0efe0a678d0c919b6d4b8ad23c89abf2364fdb42bd' 
  AND token = 'b618YmIwjkFTZqH6w2MUVTGWVF+LjJrnICUzh4teGXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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