SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b86eb93ea25a7d94933b1a7d687d35e772df8b4bcc3e203e8031402d16b067a0' 
  AND token = '/xTQUQgNu1EZGIyKrX7aDLyiGwpQfY4Q1fYKo+HcFjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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