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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8dc110afcb019577126d73961daf6c5e50b69a45ed0ddc0587036687880c7fc8' 
  AND token = '/+aeZ6ObMZxPOuYWy9YFXU5Z9dACFl0wHlX7xe55uDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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