SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9677db3f710444f4b923d2b2a9cea1e415761345f38a526b7bbf46881bbf0368' 
  AND token = '6Vl1x6+iJJ6FUHT4lL7nhGiWvR3vVSSkutxOZabKX5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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