SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc19d1c642de3c686f664d250087b0a7fe9d87444d16e2d8f2e7ce20ab20908b' 
  AND token = '5CJCFbl5mTh+LzADI1KzwSGY+y3VtOkfocpTMouuFNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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