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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7224686aeb1d08a1c7187996de4ac2b4ef2dae90378a3b9ad53f3809e56dba25' 
  AND token = 'MQkibZJY8eeodekesrYiQRh7BpNrhOYVxvXiEvHdJgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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