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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4423b23b791a54b9f7a03c9b2d9e987772323974c9ec0d5d8b9a409e3c107e93' 
  AND token = 'dukihNtRiDW+HJFHlMzqnWpKt5p09/9OtD/AhNQOxQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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