SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93af65f91cf9dd7abfa44666bd53b5405364ab37ef27f7514b750d8fc6c83b8b' 
  AND token = 'YLJqXr5WW9rVy+IjxYRvtTtg9OTdvG9KRaCKFtDJPkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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