SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4039948de871f01925c303c5d6567e2ab070cd698d7de27c20eaaa85cb696e01' 
  AND token = '4EMmDeqnK7lZTjTkvVLyJ7m9ZZR1fbY2e/+Mrz8BVoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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