SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50544fa67772dde7784e2ecd03fca3fa3dfa6c047dff59d988f8f55414fcae27' 
  AND token = 'RIqwH9J9ovVzapG7/ypSXJPVgJmODQrO6LHAK+Afxrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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