SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f35f4a42babd323f6a6992985873578363063018f3231704194927111eeae77' 
  AND token = 'TuUIC02Ug87bmJlnTh+YZ1RrfgRU4GR0VYwfcHGK90c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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