SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4fece93ec0bcbf5e962ae63b2df41c644e1a367337c47cebae281acfb98805f0' 
  AND token = 'ZzajyEk6grtpLAmcJ+G7sPOApq/6wNVwM+JaEG5P/Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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