SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1050a6a66e97ccda65a852364ee0f3577a886d30211f18e0eaa8383636029b68' 
  AND token = 'Wl+lrPNuVqphxh/KzSoUQajS/I5YL+aDZkAwFnOnCr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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