SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37086fb91352acfa7e7fdd6150a44f9b3419b480c929d4c5fabd5292eb4768b1' 
  AND token = 'fRXPxo7uZzDNs0NjkuTF7oGa53KOJ9GraYXbwv8+F0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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