Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc4b3524f105df62d21f8a02b2fe3cf9c3b3afdefca14a81b37bcd90ed7d7d9c' 
  AND token = '/KyYGFcne1wdGVeofCuqR1uRw2nl9ZspoRtzS8UfxIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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