SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7770ba4f6d070700ba185ac7ba91f49c116ffedff3b119ecb9c6754d555481b' 
  AND token = 'UlRi4WF0m+7QN+O0hHKzLVLZ3YQVasGoO/S04gIYE0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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