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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '530eea160d72ae58333697642db46fdf842920a5c54d1c8e97b313132a409b80' 
  AND token = '3W9sAI8cZYQq6ku1+ekXIUQ0DJL0KndSCdPEQXs8zTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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